Reinforced concrete (RC) moment frames are often used in building applications. During strong earthquake excitations, such buildings have been subject to soft-story or column sidesway failure mechanisms. These mechanisms are characterized by the development of plastic hinges at all columns or joints of a story, rendering the structure unstable under further lateral loading. Previous research efforts have shown that the column-to-beam flexural strength ratio at the joints in RC frame buildings plays a significant part in determining the building's response to seismic loading, including whether or not a story mechanism will form.